/Engine/Plugins/Runtime/Metasound/Source/MetasoundEngine/Public/MetasoundGeneratorHandle.h
Makes a copy of the supplied parameter pack and passes it to the MetaSoundGenerator for asynchronous processing. IT ALSO caches this copy so that if the AudioComponent is virtualized the parameter pack will be sent again when/if the AudioComponent is "unvirtualized".
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="MetaSoundParameterPack") bool ApplyParameterPack ( [UMetasoundParameterPack](API\Plugins\MetasoundFrontend\UMetasoundParameterPack) * Pack )